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Deciphering dynamic surface of PtRu alloy nanocatalysts to revisit their synergistic effects during the electrooxidation

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Science China Chemistry 2024年第7期67卷 2224-2233页

作者： Xiao-Chong Li Bo Wang Zhou Yu Qiang Wan Ju-fang zheng Emmanuel Maisonhaute Xiao-Shun Zhou Ya-Hao Wang Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical ChemistryZhejiang Normal UniversityJinhua 321004China Laboratoire Interface et Systèmes Electrochimiques CNRS UMR 8235Sorbonne UniversitéF-75252 Paris cedex 5France

Correlating dynamic structural transformation of catalysts with the surface intermediate species under operating conditions is critical for updating the understanding of structure–performance ***,we probe the electrochemical potentialdependent surface structures and adsorbed intermediates on PtRu binary alloy nanocatalysts to revisit its synergistic mechanisms for CO electrooxidation enhanced ***-situ spectral characteristics by using modified shell-isolated nanoparticle-enhanced Raman spectroscopy,show that in acidic solution,when the potential is positively scanned from 0.1 V to 1.5 V relative to reversible hydrogen electrode(RHE),the surface of the alloy catalyst evolves from metallic PtRu to adsorbed oxygen gradually covering and accumulating on Ru sites(denoted as PtRuO_(x),x≤2),forming segregated RuO_(2),and finally forming a threedimensional oxide layer(denoted as 3D PtRuO_(4)).Moreover,molecular evidence associated with periodic density functional theory calculations reveals that electronic effects promote ruthenium to become more oxidizable and *** particular,we found here that ^(*)O and ^(*)OH at surface RuO_(x) sites are highly efficient CO oxidation active species in comparison to the same entities adsorbed on metallic Ru *** work sheds light on the complex surface dynamic process of practical Pt-based binary nanocatalysts and improves the understanding of synergistic mechanism for the development of fuel cell devices.

关键词： in-situ Raman spectroscopy surface evolution bifunctional mechanism PtRu electrooxidation

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基于X射线吸收谱的不同生物组织的辨识

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高等学校化学学报 2018年第7期39卷 1434-1439页

作者：王倩杨正方正厦门大学仪器与电气系厦门361005

为了验证X射线吸收光谱法对生物组织的辨识能力,选取猪的心脏、肝、肾、胃、瘦肉以及肥肉作为实验样本,以55 k V的电压激发X射线管,利用X射线探测器获取这6类生物组织样本的X射线吸收光谱.将采集到的光谱数据分为测试集与训练集,利用主... 详细信息

为了验证X射线吸收光谱法对生物组织的辨识能力,选取猪的心脏、肝、肾、胃、瘦肉以及肥肉作为实验样本,以55 k V的电压激发X射线管,利用X射线探测器获取这6类生物组织样本的X射线吸收光谱.将采集到的光谱数据分为测试集与训练集,利用主成分分析法提取光谱主成分,以训练集为输入建立径向基函数(RBF)神经网络分类预测模型,对测试集样本进行分类预测.通过交叉验证法对所有样本进行辨识的识别正确率达到90.22%.实验结果表明,X射线光谱技术结合主成分分析法和RBF神经网络能够很好地用于猪的组织分类,对将X射线光谱技术应用于生物组织辨识具有重要的指导意义.

关键词： X射线吸收光谱生物组织分类识别径向基函数神经网络

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Alerting effects of light in healthy individuals: a systematic review and meta-analysis

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Neural Regeneration Research 2022年第9期17卷 1929-1936页

作者： Yi-Man Mu Xiao-Dan Huang Sui Zhu zheng-fang Hu Kwok-Fai So Chao-Ran Ren Qian Tao Department of Public Health and Preventive Medicine School of Basic MedicineJinan UniversityGuangzhouGuangdong ProvinceChina Division of Medical Psychology and Behavior Science School of Basic MedicineJinan UniversityGuangzhouGuangdong ProvinceChina Guangdong-Hongkong-Macao Institute of CNS Regeneration Ministry of Education CNS Regeneration Collaborative Joint LaboratoryJinan UniversityGuangzhouGuangdong ProvinceChina Guangzhou Regenerative Medicine and Health Guangdong Laboratory GuangzhouGuangdong ProvinceChina Center for Brain Science and Brain-Inspired Intelligence Guangdong-Hong Kong-Macao Greater Bay AreaGuangzhouGuangdong ProvinceChina Neuroscience and Neurorehabilitation Institute University of Health and Rehabilitation ScienceQingdaoShandong ProvinceChina Co-innovation Center of Neuroregeneration Nantong UniversityNantongJiangsu ProvinceChina

Light plays an essential role in psychobiological and psychophysiological processes,such as *** alerting effect is influenced by light characteristics and the timing of *** meta-analysis is the first to systematically review the effect of light intervention on alertness and to discuss the optimal protocol for light *** this meta-analysis,registered at PROSPERO(Registration ID:CRD42020181485),we conducted a systematic search of the Web of Science,PubMed,and PsycINFO databases for studies published in English prior to August *** outcomes included both subjective and objective *** analyses considered a variety of factors,such as wavelength,correlated color temperature(CCT),light illuminance,and timing of interventions(daytime,night-time,or all day).Twenty-seven crossover studies and two parallel-group studies were included in this meta-analysis,with a total of 1210 healthy participants(636(52%)male,mean age 25.62 years).The results revealed that light intervention had a positive effect on both subjective alertness(standardized mean difference(SMD)=-0.28,95%confidence interval(CI):-0.49 to-0.06,P=0.01)and objective alertness in healthy subjects(SMD=-0.34,95%CI:-0.68 to-0.01,P=0.04).The subgroup analysis revealed that cold light was better than warm light in improving subjective alertness(SMD=-0.37,95%CI:-0.65 to-0.10,P=0.007,I2=26%)and objective alertness(SMD=-0.36,95%CI:-0.66 to-0.07,P=0.02,I2=0).Both daytime(SMD=-0.22,95%CI:-0.37 to-0.07,P=0.005,I2=74%)and night-time(SMD=-0.32,95%CI:-0.61 to-0.02,P=0.04,I2=0)light exposure improved subjective *** results of this meta-analysis and systematic review indicate that light exposure is associated with significant improvement in subjective and objective *** addition,light exposure with a higher CCT was more effective in improving alertness than light exposure with a lower *** results also suggest that both daytime and night-time light exposure can

关键词： correlated color temperature illuminance light meta-analysis objective alertness subjective alertness time of light intervention wavelength

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Effect of an Airbag-selective Portal Vein Blood Arrester on the Liver after Hepatectomy:A New Technique for Selective Clamping of the Portal Vein

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Current Medical Science 2024年第2期44卷 380-390页

作者： Ce-xiong FU Xiao-ri QIN Jin-song CHEN Jie ZHONG Yu-xu XIE Bi-dan LI Qing-qing FU fang LI Jin-fang zheng Department of Hepatobiliary and Pancreatic Surgery Hainan General HospitalHainan Affiliated Hospital of Hainan Medical UniversityHaikou 570311China University of South China Hengyang 421001China Department of Gastroenterology Gastroenterology Endoscopy CenterHainan General HospitalHainan Affiliated Hospital of Hainan Medical UniversityHaikou 57031lChina Center of Clinical Laboratory Hainan General HospitalHainan Affiliated Hospital of Hainan Medical UniversityHaikou 570311China Department of Radiology Hainan General HospitalHainan Affiliated Hospital of Hainan Medical UniversityHaikou 570311China

Objective:A novel technique was explored using an airbag-selective portal vein blood arrester that circumvents the need for an intraoperative assessment of anatomical variations in patients with complex intrahepatic space-occupying ***:Rabbits undergoing hepatectomy were randomly assigned to 4 groups:intermittent portal triad clamping(PTC),intermittent portal vein clamping(PVC),intermittent portal vein blocker with an airbag-selective portal vein blood arrester(APC),and without portal blood occlusion(control).Hepatic ischemia and reperfusion injury were assessed by measuring the 7-day survival rate,blood loss,liver function,hepatic pathology,hepatic inflammatory cytokine infiltration,hepatic malondialdehyde levels,and proliferating cell nuclear antigen ***:Liver damage was substantially reduced in the APC and PVC *** APC animals exhibited transaminase levels similar to or less oxidative stress damage and inflammatory hepatocellular injury compared to those exhibited by the PVC *** was significantly higher in the control group than in the other *** APC group had less bleeding than the PVC group because of the avoidance of portal vein skeletonization during ***,more operative time was saved in the APC group than in the PVC ***,the total 7-day survival rate in the APC group was higher than that in the PTC ***:Airbag-selective portal vein blood arresters may help protect against hepatic ischemia and reperfusion injury in rabbits undergoing partial *** technique may also help prevent liver damage in patients requiring hepatectomy.

关键词： hepatectomy portal vein hepatic damage selective clamping

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God is the Ultimate Jokester--Barthes’s Dead Author and the Authorless Joke

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Journal of Linguistics and Education Research 2020年第1期3卷 25-29页

作者： zheng fang Department of Education University of OxfordOxfordOX13QREngland

This study starts fromŽižek Slavoj's question about the attribution of the joke text,by borrowing Roland Barthes's theory of“the Death of the Author”in the structuralist discussion,the author's absence and the origin of the“joke”as a literary genre are *** the same time,the discussion employed the“joke”as a special genre,explained Barthes’s way of dethroning the author,as well as the way in which the reader is crowed authority to interpret the *** through the author,the reader and the function of language,Barthes’s theory of author was enlightened,with a new perspective to re-interpret the basic concept of the author in literary criticism.

关键词： Joke Authorship Structuralism The Death of the Author

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Complex wave excitations general （2＋1）-dimensional and chaotic patterns for a Korteweg-de Vries system

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Chinese Physics B 2008年第8期17卷 2767-2773页

作者： Ma Song-Hua fang Jian-Ping zheng Chun-Long Department of Physics Zhejiang Lishui University Lishui 323000 China

Starting from an improved mapping approach and a linear variable separation approach, a new family of exact solutions （including solitary wave solutions, periodic wave solutions and rational function solutions） with arbitrary functions for a general （2＋1）-dimensional Korteweg de solutions, we obtain some novel dromion-lattice solitons, system Vries system （GKdV） is derived. According to the derived complex wave excitations and chaotic patterns for the GKdV

关键词： improved mapping approach GKdv system complex wave excitations chaotic patterns

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Chrysophanol localizes in mitochondria to promote cell death through upregulation of mitochondrial cyclophilin D in HepG2 cells

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Chinese Herbal Medicines 2021年第2期13卷 221-227页

作者： Yu Xie Ling Zhang Yuan-yuan Li Dian He Li-fang zheng School of Pharmacy Lanzhou UniversityLanzhou 730000China

Objective:Chrysophanol(Chry) displays potent anticancer activity in human cancer cells and animal models,but the cellular targets of Chry have not been fully ***,we speculated whether mitochondria were a target involved in Chry-induced ***:Human liver cancer cell line HepG2 was *** cytotoxicity was evaluated by MTT *** localization was evaluated by a confocal *** membrane potential ΔΨm was detected by TMRE staining and determined by the flow *** levels of ATP,mitochondrial superoxide anions,and GSH/GSSG were determined according to the assay *** apoptosis were evaluated through Hoechst33342/PI and Annexin V/PI staining,*** expression of cyclophilin D(CyPD) was determined by immunoblot method,and the interaction between CyPD and Chry was analyzed by molecule docking ***:Chry itself mainly localized in mitocho ndria to cause mitochondrial dysfunction and cell death in HepG2 *** regard to the mechanism,cyclosporin A as the inhibitor for the formation of mitochondrial permeability transition pore(mPTP) moderately suppressed cell death,indicating mPTP involved in the process of cell ***,Chry enhanced the protein expression of Cyclophilin D(CyPD) which is a molecular componentry and a modulator of mPTP,while antioxidant N-acetyl-L-cysteine inhibited the expression of *** docking procedure disclosed two hydrogen-bonds existed in CyPD-Chry complex with-11.94 kal/mol of the binding affinity ***,the mtDNA-deficient HepG_2-ρ0 cells were much resistant to Chry-induced cell death,indicating mtDNA at least partly participated in cell death.A combination of Chry and VP-16 produced the synergism effect toward cell viability andΔΨm,while Chry combined with Cis-Pt elicited the antagonism ***:Taken together,enrichment in mitochondria and actions on mPTP,CyPD and mtDNA provides an insight into the anticancer mechanism of Ch

关键词： chrysophanol combination therapy mitochondria mitochondrial permeability transition pore mtDNA

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Anti-hepatoma Effect of DC2.4 Cells Transfected with Tumor-Associated Antigen Cdc25C In Vitro

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Current Medical Science 2022年第3期42卷 491-497页

作者： Chun-mei LI Yan-fei LI Lin TIAN Qi-hui ZHANG fang-yuan zheng Fa-rong MO School of Basic Medical Science Guangxi Medical UniversityNanning 530021China Laboratory of Hepatobiliary and Pancreatic Surgery Affiliated Hospital of Guilin Medical UniversityGuilin 541001China Guangxi Colleges and Universities Key Laboratory of Human Development and Disease Research Guangxi Medical UniversityNanning 530021China

Objective Cell division cyclin 25 homolog C(Cdc25C)is a tumor-associated antigen candidate gene,and this may be used as an effective target in cancer *** present study aims to evaluate the lysis effect of cytotoxic T lymphocytes(CTLs)induced by dendritic cell line DC2.4 overexpressing Cdc25C,and the feasibility of Cdc25C as a component in hepatoma *** The mouse Cdc25C gene was ligated into a lentiviral vector,and transfected into DC2.4 *** DC2.4 cell phenotype and cytokine secretion were determined by flow cytometry and ELISA,***8^(+)T cells were sorted from the spleens of C57BL/6 mice using a magnetic bead sorting kit obtained from Miltenyi Biotech,Germany,and co-cultured with DC2.4 cells for one week as effector ***,IL-2,granzyme B and perforin were detected in the CTL culture medium by ***,time-resolved fluorescence immunoassay was used to detect the immune killing effect of Cdc25C-specific CTLs on target ***,the effect of blocking MHC-I sites on target cells with a monoclonal anti-MHC-I antibody was *** The results revealed that Cdc25C could be stably overexpressed in DC2.4 cells by LV-Cdc25C ***2.4 cells transfected with LV-Cdc25C secreted more IL-6,IL-12,TNF-αand IFN-γ,and had higher expression levels of CD40,CD86,CCR7 and MHC-II than unaltered DC2.4 *** elevated Cdc25C in dendritic cells also further increased the secretion of IL-2,granzyme B and perforin to elicit Cdc25C-specific CTLs,and induced the higher cytotoxicity in Hepa1-6 cell lines(P<0.05),but this had no effect on the target cells when MHC-I monoclonal antibodies were *** DC2.4 cells transfected with LV-Cdc25C can induce specific CTLs,and result in a strong cellular immune *** dendritic cells that overexpress Cdc25C may be useful for hepatoma immunotherapy.

关键词： dendritic cells cell division cyclin 25 homolog C cytotoxic T lymphocytes hepatocellular carcinoma anti-hepatoma

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Slippery quartz surfaces for anti‐fouling optical windows

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Droplet 2023年第1期2卷 47-55页

作者： Minjing Li Tongzhen Yang Qing Yang Shaokun Wang zheng fang Yang Cheng Xun Hou Feng Chen School of Mechanical Engineering Xi'an Jiaotong UniversityXi'anChina State Key Laboratory for Manufacturing System Engineering and Shaanxi Key Laboratory of Photonics Technology for Information School of Electronic Science and EngineeringXi'an Jiaotong UniversityXi'anChina

The surface of camera‐based medical devices is easily smeared by blood and fog during the surgical procedure,causing visual field loss and bringing great distress to both doctors and *** this article,a slippery liquid‐infused porous surface(SLIPS)on a quartz window surface that can repel various liquids,especially blood droplets is reported.A femtosecond laser pulse train was used to create periodic microhole structures on the silica *** subsequent low surface energy treatment and lubricant infusion led to the successful preparation of a slippery *** blood‐repellent windows exhibited high transparency,great antifogging,and antibacterial *** addition,the slippery ability of the as‐prepared surface exhibited outstanding stability since the surface could withstand harsh treatments/environments,such as repeated pipette scratches and immersion in different pH *** as‐prepared millimeter‐sized quartz samples with SLIPS were attached to the endoscope lens as a protective coating and could maintain high visibility after repeated immersion in *** believe that the coating developed in this study will provide inspiration for the design of next‐generation endoscopes or other camera‐guided devices that will resist fouling,keep clear vision,and reduce operation time,thus offering great potential applications in lesion diagnosis and therapy.

关键词： quartz fouling visibility

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Sunway supercomputer architecture towards exascale computing: analysis and practice

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Science China(Information Sciences) 2021年第4期64卷 177-197页

作者： Jiangang GAO fang zheng Fengbin QI Yajun DING Hongliang LI Hongsheng LU Wangquan HE Hongmei WEI Lifeng JIN Xin LIU Daoyong GONG Fei WANG Yan zheng Honghui SUN Zhou ZHOU Yong LIU Hongtao YOU National Research Center of Parallel Computer Engineering and Technology

In recent years, the improvements of system performance and energy efficiency for supercomputers have faced increasing challenges, which create more intensive demands on the architecture design for realizing exascale computing. This paper first analyzes the main requirements of exascale computing on the aspects of the parallel computing application and supercomputing center operation. Afterwards, a mapping scheme of "demands-challenges-architecture" is proposed. Then, the major challenges of exascale supercomputer, such as scalability, power consumption, data movement, programming and availability, are thoroughly analyzed, and the corresponding appropriate solutions are proposed. Moreover, this paper proposes the Sunway computer architecture towards exascale computing in which the many-core processor, network chipset and software system are all domestically-designed. The technology roadmap of Sunway supercomputer will hold the comprehensive design methods for the architecture, including the processor, interconnect network,assembly structure, power supply, cooling system, system software, parallel algorithm and application support, promising great advances for exascale supercomputing.

关键词： supercomputer exascale Sunway scalability power consumption data movement programming availability

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